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EXHIBIT 23.28(A)

ASSIGNMENT OF HEREDITARY RIGHTS

PASCUALA LATORRE GODOY

TO

MINERA LUMINA COPPER CHILE S.A.

In Copiapó, Republic of Chile, on the 26th of
Octobre 2005, before me ARMANDO CAMPOS ORTEGA,lawyer, and Deputy Notary
Public of the Copiapó, of Mr. Hernán Cañas Valdés, located at OHiggins 676,
Copiapó, hereby appears: Mrs. PASCUALA LATORRE GODOY, Chilean, widow,
Housewife, Identity Card No3.138.197 -5, domiciled at Manuel Rodríguez street
No515, County of Copiapó, Copiapó, hereinafter the Assignor; and Mr. JOHN
JOSEPH SELTERS,American, single, Mining Engineer, Identity Card for
Foreigners No14.427.974 -3, in the representation of MINERA LUMINA COPPER
CHILE S.A.,hereinafter also LUMINAor the Assignee, Tax
Registration No99.531.960 -8, both domiciled for these effects in Las Nieves
street No3331, County of Vitacura, Santiago; who evidence their identities with
the above mentioned Identity Cards and declare:

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FIRST:By public deed of partition granted
on the 26 of April 1941, before the Public Notary from Copiapó Mr. Oscar Nuñez,
Mr. Erasmo and Mr. Fortunato Latorre Mercado were granted as jointly owners of
the Hijuela 2formed by: A) the property known as the Fundo
Ramadilla del Norte, located in the sub-delegation of San Antonio and that
borders: To the North, with the mountainous areas of Ramadas; to the South, with
the property owned by Mrs. Mariana Mercado; to the East, with the property owned
by Mrs. Sinforiana Latorre and to the West, with the camino
Real1 that goes to the Republic of Argentine and that
includes three alfalfa2 estates and four mountainous
areas; B) the property known as the Fundo Potrero Grande, in the same
sub-delegation, granted with two hours of water and that borders: To the North,
with the Hijuela owned by Mrs.3 Santos Latorre de Barrera; to
the South, with the camino Real4;to the East,
with lands owned by Mr. Francisco Javier Rojas; and to the West, with the
camino Real5and lands owned by Mrs. Sinforiana
Latorre that include four estates, a building and an orchard. The adjudging of
the two estates before referred was registered at page 22 overleaf, number 31 of
the Real Estate Registry of Copiapó corresponding to the year 1948.

SECOND:By death of Mr. Fortunato Latorre
Mercado, owner of the fifty percent of the rights over the properties
individualized in the previous clause, Ramadilla del Norte and
Potrero Grande,his goods were assigned to his daughter Mrs. Pascuala
Latorre Godoy, and to his illegitimate Mr. Fortunato Osvaldo del Carmen Latorre
Pinto, notwithstanding

_____________________________________________1
Royal Road. 2 Forage.3 Due to the gender of the
name, it should be Mr..4Id. Note 1.5Id. Note
1.

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the rights of his surviving spouse Mrs. Zulema Carolina Godoy
viuda de Latorre. The posesión efectiva6 was
registered at page 169 overleaf, number 161 of the Real Estate Registry of
Copiapó corresponding to the year 1964.

THIRD:The inscripción especial de
herencia7after the death of Mr. Fortunato Latorre
Mercado regarding the estates: Hijuela del Norteand Fundo Potrero
Grande, both located in the sub-delegation of San Antonio, Copiapó, was
made at page 1518 overleaf, number 1395 of the Real Estate Registry of Copiapó
corresponding to the year 1998, that attests that notwithstanding the rights of
the surviving spouse Mrs. Zulema Carolina Godoy, Mrs. Pascuala Latorre Godoy and
Mr. Fortunato Osvaldo del Carmen Latorre Pinto8, are the jointly
owners of the fifty percent of the rights over the two estates known as
Hijuela del Norte and Potrero Grande, both located in the
sub-delegation of San Antonio, Copiapó , that border as follow: A) Hijuela
del Norte,today also known as Ramadilla Norte,borders to the
North, with the mountainous areas of Ramadas; to the South, with the property
owned by Mrs. Mariana Mercado; to the East, with the property owned by Mrs.
Sinforiana Latorre and to the West, with the camino Real9that goes to the Republic of Argentine and that includes three
alfalfa10 estates and four mountainous areas; B)
Fundo Potrero Grande, in the same sub-delegation, granted with two
hours of water and that borders: To the North, with the Hijuela owned by
Mrs.11 Santos Latorre de Barrera; to the South, with the camino
Real12;to the East, with lands owned by Mr.

_____________________________________________6
Judicial procedure for adjudging the hereditary rights. 7 Special
registration of hereditary rights.8 The name of the latter was
missed in the Spanish version of the draft.9Id. Note
1.10Id. Note 2.11 Id. Note 3.12
Id. Note 1.

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Francisco Javier Rojas; and to the West, with the camino
Real13 and lands owned by Mrs. Sinforiana Latorre that
include four estates, a building and an orchard.

FOURTH: The posesión
efectiva14 of the goods and properties left by Mrs. Mrs.
Zulema Carolina Godoy Silva was granted in favor of her daughter Mrs. Pascuala
Latorre Godoy, it was registered at page 770, number 683 of the Real Estate
Registry of Copiapó corresponding to the year 1986. Theinscripción especial
de herencia15under the name of Mrs. Pascuala Latorre
Godoy regarding the estates Ramadilla del Norte and Potrero
Grande was made at page 1300, number 981 of the Real Estate Registry of
Copiapó corresponding to the year 2000. The latter registration attests that
Mrs. Pascuala Latorre Godoy owns rights over the two estates: A) Ramadilla
del Norte,located in the sub-delegation of San Antonio, Copiapó , that
borders: to the North, with the mountainous areas of Ramadas; to the South, with
the property owned by Mrs. Mariana Mercado; to the East, with the property owned
by Mrs. Sinforiana Latorre and to the West, with the camino
Real16 that goes to the Republic of Argentine and that
includes three alfalfa17 estates and four mountainous
areas; and B) Fundo Potrero Grande, in the same sub-delegation, granted
with two hours of water and that borders: To the North, with the Hijuela
owned by Mrs.18 Santos Latorre de Barrera; to the South, with the
camino Real19;to the East, with

_____________________________________________13
Id. Note 1.14Id. Note 6.15Id. Note 7.16Id. Note 1.17Id. Note 2.18Id. Note
3.19Id. Note 1.

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lands owned by Mr. Francisco Javier Rojas; and to the West,
with the camino Real20 and lands owned by Mrs.
Sinforiana Latorre that include four estates, a building and an orchard.

FIFTH:By the present act Mrs. Pascuala
Latorre Godoy, as provided in the article 1909 of the Civil Code, assigns and
transfers all her hereditary rights in the inheritance of her parents Mr.
Fortunato Latorre Mercado and Mrs. Zulema Carolina Godoy viuda de Latorre and
specially her rights over the Hijuela del Norte or Ramadilla
Norte, and Fundo Potrero Grande,including its water rights,
individualized in the clauses First and Third of the present instrument; to
Minera Lumina Copper Chile S.A., for whom its representative Mr. John Joseph
Selters pays and accepts.

SIXTH:The price of the assignment of rights
  owned by the Assignor on the inheritance of her parents and specially her rights
  over the estates Hijuela del Norte or Ramadilla
  Norte,is the total amount of 27,850.8056 Unidades de Fomento21.The
  price of the assignment of rights owned by the Assignor over the estate known
  as Potrero Grande,including its water rights, is the total
  amount of 200 Unidades de Fomento22. Then, the total
  price of the rights that Mrs. Pascuala Latorre Godoy sells, assigns and transfers
  to Minera Lumina Copper Chile S.A., is the amount of 28,050.8056 Unidades
  de Fomento23 that the Assignee pays to the Assignor as
  follows:

A) With the amount of 7,012.7014 Unidades de Fomento24
  equivalent to $125,000,000.-that is paid by Minera Lumina Copper Chile S.A.
  through a vale vista25 under the name of

_____________________________________________20Id. Note 1.21Equivalent to US$950,000.- aprox.22Equivalent to US$6,850.- aprox.23Equivalent to
US$956,850.- aprox.24Equivalent to US$240,500.- aprox.

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Mrs. Pascuala Latorre Godoy, with the instruction to give it to
him once this assignment of rights be registered at the Custodian of Real Estate
of Copiapó under the name of the assignee, Mrs. Pascuala Latorre Godoy declares
to receive such amount to his full and entire satisfaction.

B) With the amount of 8,064.60662 Unidades de
Fomento26 that shall be paid by Minera Lumina Copper Chile
S.A. to the Assignor not later than October 31, 2006. This amount comprises the
installment of 7,012.7014 Unidades de Fomento27plus
1,521Unidades de Fomentocorresponding to a 5% interest over the pending
balance of 21,038.1042 Unidades de Fomento.

C) With the amount of 7,713.97155 Unidades de Fomento28
  that shall be paid by Minera Lumina Copper Chile S.A. to the Assignor not later
  than October 31, 2007. This amount comprises the installment of 7,012.7014 Unidades
  de Fomento29plus 701.27014 Unidades de Fomentocorresponding
  to a 5% interest over the pending balance of 14,025.4028 Unidades de Fomento.

D) With the amount of 7,363.33648 Unidades de Fomento30
  that shall be paid by Minera Lumina Copper Chile S.A. to the Assignor not later
  than October 31, 2008. This amount comprises the installment of 7,012.7014 Unidades
  de Fomento31plus 350.63507 Unidades de Fomentocorresponding
  to a 5% interest over the pending balance of 7,012.7014 Unidades de Fomento.

_____________________________________________25Cashier check paid as ordered by the issuer.26Equivalent
to US$276,500.- aprox.27Id. Note 24.28Equivalent
to US$264,500.- aprox.29Id. Note 24.30Equivalent
to US$252,500.- aprox.31Id. Note 24.

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All the payments shall be made in the city of Copiapó through a
public deed granted before the Public Notary Mr. Hernán Cañas Valdés, or who
replaces or succeeds him at any title, however, this obligation shall be deemed
duly and timely fulfilled at the time of the delivery to the Notary who
authorizes this public deed, or to his successor or deputy, of a vale vista
bancario32 or a term deposit issued in current national
currency under the name of Mrs. Pascuala Latorre Godoy, for the total amount of
each installment of the total price. If Mrs. Pascuala Latorre Godoy passes away
being pending an installment, the payment shall be received by the attorney
jointly appointed by the heirs, provided they have been declared as heirs by a
resolution issued by the Servicio de Registro
Civil33.

SEVENTH:In the case that Minera Lumina
Copper Chile S.A. will not carry out some of payments before indicated in
letters B), C), and D), in the dates mentioned therein, it shall be understood
that Minera Lumina Copper Chile S.A. is not interested in pursuing this
contract, having to be solved ipso facto the present agreement of
assignment of rights and to be canceled all the registrations made in the Real
Estate Registry of Copiapó in its virtue, acquiring the Assignor, as only
indemnification of damages, the payments received from Minera Lumina Copper
Chile S.A. as part of the total price, not being able the assignor and/or her
heirs to claim the payment of the pending balance of the price or the
indemnification of any damage. It is expressly prohibited to Mrs. Pascuala
Latorre Godoy to assign all or some installments before referred in the clause
sixth. This prohibition shall be registered in the Registry of Prohibitions of
the Custodian of Real Estate of Copiapó.

_____________________________________________32
Cashier check paid as ordered by the issuer.33Civil Registry
Service.

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EIGHTH:By this instrument, the Assignor
hereby delivers to Minera Lumina Copper Chile S.A. the titles that attest her
rights of inheritance being assigning herein and in this act the Assignor also
transfers the rights of inheritance that are being assigned to Minera Lumina
Copper Chile S.A. The bearer of a certified copy of this deed is authorized to
request the registration of the present assignment of hereditary rights in the
Real Estate Registry of the Custodian of Real Estate of Copiapó.

NINTH:For all legal purposes hereof, the
parties hereto set their domicile as follows: a) Mrs. Pascuala Latorre Godoy,
Manuel Rodríguez 515, Copiapó; b) Minera Lumina Copper Chile S.A. and Mr. John
J. Selters, Las Nieves street No 3331, County of Vitacura, Santiago.

TENTH:Any notice that is require to be
communicated from one party to the other in relation to the present contract,
will be sent through a Public Notary to the domiciles provided in clause tenth
hereinabove. Any notice of change to the referred domiciles will be communicated
from one party to the other through a certified letter sent by the Public Notary
where this public deed is signed.

ELEVENTH:The parties hereto agree that if
the payment day for the payment of any of the installments, as set forth in
clause sixth, falls on Saturday or on any holiday, the payment will take place
at the following working day.

TWELVETH:The expenses and rights arising
from this Agreement and its registration at the Custodian of Real Estate will be
borne by the Assignee.

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THIRTEENTH:For all purposes hereof, the parties hereto set their domicile in the city of Copiapó and keep under the jurisdiction of their Courts of Justice. The bearer of a duly authorized copy of this agreement is
empowered to require all pertinent annotations, registrations and cancellations at the Custodian of Real Estate of Copiapó, as well as at any other pertinent Public Record Office.

FOURTEENTH:The appearing parties, hereby grant a power of attorney in favor of Messrs. Jaime Alvarez Cáceres and Jerónimo Carcelén Pacheco, so that any of them, indistinctly, may grant the public deed or
deeds that may be necessary, as well as one or more minutes, to clarify, supplement or rectify this public deed, with the purpose of amending the mistakes and missing wording in this public deed, such as the individualization of the appearing
parties, the inheritances and their registrations, mistakes on the dates of the agreements mentioned in those registrations made in any of the Registries of the Custodian of Real Estate of Copiapó, or in any other mention that may be required
by that Custodian in order to clarify, supplement or rectify without affecting the nature and purpose of the referred acts and agreements.

The legal capacity of Mr. John J. Selters to act on behalf of MINERA LUMINA COPPER CHILE S.A. is stated on the public deed dated August 20th, 2003, granted before the Public Notary of Santiago, Mr. Eduardo Avello Concha.

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MINERA LUMINA COPPER CHILE S.A.



PASCUALA LATORRE GODOY

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EXHIBIT 23.28(B)

ASSIGNMENT OF HEREDITARY RIGHTS

RICARDO SEVERO LATORRE RALPH

TO

MINERA LUMINA COPPER CHILE S.A.

In Copiapó, Republic of Chile, on the 26thof
  Octobre 2005, before me ARMANDO CAMPOS ORTEGA,lawyer, and Deputy Notary
  Public of the Copiapó, of Mr. Hernán Cañas Valdés, located
  at OHiggins 676, Copiapó, hereby appears: Mrs. RICARDO SEVERO
  LATORRE RALPH, Chilean, Identity Card No2.457.291 -9, Farmer, married
  to Mrs. Elda Gladys Rojas Picón, Housewife, Identity Card No2.762.240
  -2, who also appears, both domiciled at Atacama street No970, County of
  Copiapó, Copiapó, hereinafter the Assignor; and Mr. JOHN
  JOSEPH SELTERS,American, single, Mining Engineer, Identity Card for Foreigners
  No14.427.974 -3, in the representation of MINERA LUMINA COPPER
  CHILE S.A.,hereinafter also LUMINAor the
  Assignee, Tax Registration No99.531.960 -8, both domiciled for these
  effects in Las Nieves street No3331, County of Vitacura, Santiago; who
  evidence their identities with the above mentioned Identity Cards and declare:

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FIRST:By public deed of partition granted
  on the 26 of April 1941, before the Public Notary from Copiapó Mr. Oscar
  Nuñez, Mr. Erasmo and Mr. Fortunato Latorre Mercado were granted as jointly
  owners of the Hijuela 2formed by: A) the property known
  as the Fundo Ramadilla del Norte, located in the sub-delegation
  of San Antonio and that borders: To the North, with the mountainous areas of
  Ramadas; to the South, with the property owned by Mrs. Mariana Mercado; to the
  East, with the property owned by Mrs. Sinforiana Latorre and to the West, with
  the camino Real1 that goes to the Republic
  of Argentine and that includes three alfalfa2 estates
  and four mountainous areas; B) the property known as the Fundo Potrero
  Grande, in the same sub-delegation, granted with two hours of water
  and that borders: To the North, with the Hijuela owned by Mrs.3
  Santos Latorre de Barrera; to the South, with the camino Real4;to the East, with lands owned by Mr. Francisco Javier Rojas; and to the
  West, with the camino Real5and lands owned
  by Mrs. Sinforiana Latorre that include four estates, a building and an orchard.
  The adjudging of the two estates before referred was registered at page 22 overleaf,
  number 31 of the Real Estate Registry of Copiapó corresponding to the year
  1948.

SECOND:By death of Mr. Erasmo Latorre Mercado,
  owner of the fifty percent of the rights over the properties individualized
  in the previous clause, Ramadilla del Norte and Potrero
  Grande,his goods were assigned to his sons and daughter Messrs. Erasmo

_____________________________________________
  1 Royal Road. 2 Forage.3 Due to the gender of the name, it should be Mr..4Id. Note 1.5Id. Note 1.

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Osvaldo, Moisés Armando, Aaron Fernando, María Laura,
  Ricardo Severo, Elcías Daniel and Jesús Gabriel Latorre Ralph, notwithstanding
  the rights of his surviving spouse Mrs. Carmela or Carmen Ralph Cerezo viuda
  de Latorre. The posesión efectiva6
  was registered at page 303 overleaf, number 366 of the Real Estate Registry
  of Copiapó corresponding to the year 1954.

THIRD:The inscripción especial
  de herencia7after the death of Mr. Erasmo Latorre
  Mercado regarding the estates: Hijuela del Norteand Fundo
  Potrero Grande, both located in the sub-delegation of San Antonio,
  Copiapó, was made at page 220, number 229 of the Real Estate Registry of
  Copiapó corresponding to the year 1956, that attests that notwithstanding
  the rights of the surviving spouse Mrs. Carmen Ralph Cerezo viuda de Latorre,
  Messrs. Erasmo Osvaldo, Moisés Armando, Aaron Fernando, María Laura,
  Ricardo Severo, Elcías Daniel and Jesús Gabriel Latorre Ralph, are
  the jointly owners of the fifty percent of the rights over the two estates known
  as Hijuela del Norte and Potrero Grande,
  both located in the sub-delegation of San Antonio, Copiapó , that border
  as follow: A) Hijuela del Norte, today also known as Ramadilla
  Norte,borders to the North, with the mountainous areas of Ramadas;
  to the South, with the property owned by Mrs. Mariana Mercado; to the East,
  with the property owned by Mrs. Sinforiana Latorre and to the West, with the
  camino Real8 that goes to the Republic
  of Argentine and that includes three alfalfa9 estates
  and four mountainous areas; B) Fundo Potrero Grande, in the
  same sub-delegation, granted with two hours of water and that

_____________________________________________
  6 Judicial procedure for adjudging the hereditary rights. 7 Special registration of hereditary rights.8Id. Note 1.9Id. Note 2.

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borders: To the North, with the Hijuela owned by Mrs.10
  Santos Latorre de Barrera; to the South, with the camino Real11;to the East, with lands owned by Mr. Francisco Javier Rojas; and to the
  West, with the camino Real12 and lands
  owned by Mrs. Sinforiana Latorre that include four estates, a building and an
  orchard.

FOURTH:By public deed granted on March
  20th, 1958, before the Public Notary of Copiapó Mr. Roberto
  Fuentes Hurtado, Mrs. Barbarita del Carmen Ralph viuda de Latorre and Mr. Gabriel
  Latorre Ralph assigned to Mr. Osvaldo Latorre Ralph all their rights acquired
  from Mr. Erasmo Latorre Mercado over the fifty percent of the rights over the
  two estates known as Hijuela del Norte and Potrero
  Grande, both located in the sub-delegation of San Antonio, Copiapó
  , that border as follow: A) Hijuela del Norte,today also
  known as Ramadilla Norte, borders to the North, with the
  mountainous areas of Ramadas; to the South, with the property owned by Mrs.
  Mariana Mercado; to the East, with the property owned by Mrs. Sinforiana Latorre
  and to the West, with the camino Real13
  that goes to the Republic of Argentine and that includes three alfalfa14
  estates and four mountainous areas; B) Fundo Potrero Grande,
  in the same sub-delegation, granted with two hours of water and that borders:
  To the North, with the Hijuela owned by Mrs.15Santos Latorre
  de Barrera; to the South, with the camino Real16;to the East, with lands owned by Mr. Francisco Javier Rojas; and to the
  West, with the camino Real17 and lands

_____________________________________________
  10 Id. Note 3.11 Id. Note 1.12 Id. Note 1.13 Id. Note 1.14 Id. Note 2.15 Id. Note 3.16 Id. Note 1.17 Id. Note 1.

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owned by Mrs. Sinforiana Latorre that include four estates, a
  building and an orchard. The assignment of rights was registered at page 92
  overleaf, number 101 of the Real Estate Registry of Copiapó corresponding
  to the year 1958.

FIFTH: The hereditary rights acquired by
  Mr. Osvaldo Latorre Mercado from Mrs. Barbarita del Carmen Ralph viuda de Latorre
  and Mr. Gabriel Latorre Ralph, over the estate known as Hijuela del
  Norte located in the County of Tierra Amarilla, Copiapó,
  that borders as follow: to the North, with the mountainous areas of Ramadas;
  to the South, with the property owned by Mrs. Mariana Mercado; to the East,
  with the property owned by Mrs. Sinforiana Latorre and to the West, with the
  camino Real18 that goes to the Republic
  of Argentine and that includes three alfalfa19 estates
  and four mountainous areas. That estate was auctioned by order of the 1st
  Court of Copiapó and adjudged to Mr. Rafael Fernández de la Bastidas
  as set forth in the public deed granted on December 31, 1963, before the Public
  Notary of Copiapó Mr. Roberto Fuentes Hurtado. The adjudication was registered
  at page 87 overleaf, number 82 of the Real Estate Registry of Copiapó corresponding
  to the year 1964.

SIXTH: By public deed granted on May 9th,
  1964, Mr. Rafael Fernández de la Bastidas assigned to Mr. Ricardo Latorre
  Ralph all his rights over the estate before mentioned and known as Hijuela
  del Norte located in the County of Tierra Amarilla, that borders
  as follow: to the North, with the mountainous areas of Ramadas; to the South,
  with the property owned by Mrs. Mariana Mercado; to the East, with the property
  owned by Mrs.

_____________________________________________
  18 Id. Note 1.19 Id. Note 2.

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Sinforiana Latorre and to the West, with the camino
  Real20 that goes to the Republic of Argentine and
  that includes three alfalfa21 estates and four mountainous
  areas. The assignment of rights was registered at page 377, number 351 of the
  Real Estate Registry of Copiapó corresponding to the year 1964.

SEVENTH: By public deed granted on May 23rd,
  1957, before the Public Notary of Copiapó Mrs. Hilda Barraza de Ampuero,
  deputy of Mr. Osvaldo Pacheco Pizarro, Mr. Elcías Latorre Ralph assigned
  to Mr. Ricardo Latorre Ralph all his rights over the estate before mentioned
  and known as Hijuela del Norte located in the County of Tierra
  Amarilla, Copiapó, that borders as follow: to the North, with the mountainous
  areas of Ramadas; to the South, with the property owned by Mrs. Mariana Mercado;
  to the East, with the property owned by Mrs. Sinforiana Latorre and to the West,
  with the camino Real22 that goes to the
  Republic of Argentine and that includes three alfalfa23
  estates and four mountainous areas. The assignment of rights was registered
  at page 171, number 217 of the Real Estate Registry of Copiapó corresponding
  to the year 1957.

EIGHTH: By public deed granted on September
  20th, 1955, before the Public Notary of Copiapó Mrs. Hilda Barraza
  de Ampuero, deputy of Mr. Roberto Fuentes, Mrs. María Laura Latorre Ralph
  de Meléndez assigned to Mr. Ricardo Latorre Ralph all her rights over the
  estate known as Hijuela del Norte located in the sub-delegation
  of San Antonio, that borders as follow: to the North, with the mountainous areas
  of Ramadas; to the South, with the property owned by Mrs. Mariana Mercado; to
  the East, with the property owned by

_____________________________________________
  20 Id. Note 1.21 Id. Note 2.22 Id. Note 1.23 Id. Note 2.

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Mrs. Sinforiana Latorre and to the West, with the camino
  Real24 that goes to the Republic of Argentine and
  that includes three alfalfa25 estates and four mountainous
  areas. The assignment of rights was registered at page 230, number 220 A of
  the Real Estate Registry of Copiapó corresponding to the year 1956.

NINTH:Due to the acts and agreements before
  referred, Mr. Ricardo Latorre Ralph is the current owner of: (A) rights acquired
  as heir of Mr. Erasmo Latorre Mercado over the estate known as Ramadilla
  del Norteor Hijuela del Norte,individualized
  in the clauses First and Third of the present instrument and located in the
  sub-delegation of San Antonio, Copipó, today County of Tierra Amarilla,
  Province of Copiapó; (B) rights acquired from Mr. Elcías Daniel Latorre
  Ralph over the estate known as Hijuela del Norte,as set
  forth in the clause Seventh; (C) rights over the estate known as Hijuela
  del Nortethat were owned by Mrs. Barbarita del Carmen Ralph viuda
  de Latorre and Mr. Gabriel Latorre Ralph and lately assigned to Mr. Osvaldo
  Latorre Ralph as set forth in the clause Fourth. These rights were acquired
  by Mr. Rafael Fernández de la Bastidas in the auction ordered by the 1st
  Court of Copiapó as set forth in the clause Fifth; who finally assigned
  them to Mr. Ricardo Latorre Ralph as set forth in the clause Sixth; (D) rights
  acquired from Mrs. María Laura Latorre Ralph over the estate known as Hijuela
  del Norteor Ramadilla Norte,as set forth in the
  clause Eighth.

TENTH:Mr. Ricardo Latorre Ralph also holds
  the rights acquired as heir of Mr. Erasmo Latorre Mercado over the estate known
  as Fundo Potrero Grande,individualized in the clauses First
  and Third of the present instrument.

_____________________________________________
  24Id. Note 1.25 Id. Note 2.

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ELEVENTH:By the present act Mr. Ricardo
  Latorre Ralph, assigns and transfers all his hereditary rights in the inheritance
  of his father Mr. Erasmo Latorre Mercado, and specially his rights over the
  Hijuela del Norte or Ramadilla Norte,
  and Fundo Potrero Grande,individualized in the clauses First
  and Third of the present instrument; to Minera Lumina Copper Chile S.A., for
  whom its representative Mr. John Joseph Selters pays and accepts.

TWELVETH:In the same way, by the present
  act Mr. Ricardo Latorre Ralph, expressly authorized by his wife, Mrs. Elda Gladys
  Rojas Picón, duly represented in this instrument by Mrs. Pamela Patricia
  Latorre Rojas and Mr. Ricardo Alfonso Latorre Rojas, hereby sells, assigns and
  transfers to Minera Lumina Copper Chile S.A., for whom its representative Mr.
  John Joseph Selters pays and accepts, all his rights over the estate known as
  Hijuela del Norte or Ramadilla Norte,
  and Fundo Potrero Grande,that acquired from Mr. Elcías
  Daniel and Mrs. María Laura Latorre Ralph, and the rights over that estate
  that used to be owned by Mrs. Barbarita del Carmen Ralph Cerezo viuda de Latorre
  and Mr. Jesús Gabriel Latorre Ralph, lately acquired from Mr. Abel Fernández
  de las Bastidas, who have had acquired them through a public auction ordered
  by the 1st Court of Copiapó as set forth in the clauses Fourt
  and Fifth of the present instrument.

THIRTEENTH:The price of the assignment
  of rights owned by the Assignor on the inheritance of his father over the estates
  Hijuela del Norte or Ramadilla Norte,as
  well as those acquired from his brother Mr. Elcías Daniel Latorre Ralph
  and his sister Mrs. María Laura Latorre Ralph and the rights that acquired
  to Mr. Abel Fernández de las

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Bastidas, is the total amount of 27,850.8056 Unidades de Fomento26.The
  price of the assignment of rights owned by the Assignor over the estate known
  as Potrero Grande,referred in the clauses Tenth, Eleventh
  and Twelveth, is the total amount of 200 Unidades de Fomento27.
  Then, the total price of the rights that Mr. Ricardo Latorre Ralph sells, assigns
  and transfers to Minera Lumina Copper Chile S.A., is the amount of 28,050.8056
  Unidades de Fomento28 that the Assignee pays to the
  Assignor as follows:

A) With the amount of 7,012.7014 Unidades de Fomento29equivalent to $125,000,000.-that is paid by Minera Lumina Copper Chile
  S.A. through a vale vista30 under the name of Mr. Ricardo
  Latorre Ralph, with the instruction to give it to him once this assignment of
  rights be registered at the Custodian of Real Estate of Copiapó under the
  name of the assignee, Mr. Ricardo Latorre Ralph declares to receive such amount
  to his full and entire satisfaction.

B) With the amount of 8,064.60662 Unidades de Fomento31
  that shall be paid by Minera Lumina Copper Chile S.A. to the Assignor not later
  than October 31, 2006. This amount comprises the installment of 7,012.7014 Unidades
  de Fomento32plus 1,521Unidades de Fomentocorresponding
  to a 5% interest over the pending balance of 21,038.1042 Unidades de Fomento.

C) With the amount of 7,713.97155 Unidades de Fomento33
  that shall be paid by Minera Lumina Copper Chile S.A. to the Assignor not later
  than October 31, 2007. This amount

_____________________________________________
  26Equivalent to US$950,000.- aprox.27Equivalent to US$6,850.- aprox.28Equivalent to US$956,850.- aprox.29Equivalent to US$240,500.- aprox.30Cashier check paid as ordered by the issuer.31Equivalent to US$276,500.- aprox.32Id. Note 29.33Equivalent to US$264,500.- aprox.

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comprises the installment of 7,012.7014 Unidades de Fomento34plus 701.27014 Unidades de Fomentocorresponding to a 5% interest
  over the pending balance of 14,025.4028 Unidades de Fomento.

D) With the amount of 7,363.33648 Unidades de Fomento35
  that shall be paid by Minera Lumina Copper Chile S.A. to the Assignor not later
  than October 31, 2008. This amount comprises the installment of 7,012.7014 Unidades
  de Fomento36plus 350.63507 Unidades de Fomentocorresponding
  to a 5% interest over the pending balance of 7,012.7014 Unidades de Fomento.

All the payments shall be made in the city of Copiapó through
  a public deed granted before the Public Notary Mr. Hernán Cañas Valdés,
  or who replaces or succeeds him at any title, however, this obligation shall
  be deemed duly and timely fulfilled at the time of the delivery to the Notary
  who authorizes this public deed, or to his successor or deputy, of a vale
  vista bancario37or a term deposit issued in current national
  currency under the name of Mr. Ricardo Severo Latorre Ralph, for the total amount
  of each installment of the total price. If Mr. Ricardo Severo Latorre Ralph
  passes away being pending an installment, the payment shall be received by the
  attorney jointly appointed by the heirs, provided they have been declared as
  heirs by a resolution issued by the Servicio de Registro Civil38.

FOURTEENTH:In the case that Minera Lumina
  Copper Chile S.A. will not carry out some of payments before indicated in letters
  B), C), and D), in the dates mentioned therein,

_____________________________________________
  34Id. Note 29.35Equivalent to US$252,500.- aprox.36Id. Note 29.37 Cashier check paid as ordered by the issuer.38Civil Registry Service.

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it shall be understood that Minera Lumina Copper Chile S.A.
  is not interested in pursuing this contract, having to be solved ipso facto
  the present agreement of assignment of rights and to be canceled all the registrations
  made in the Real Estate Registry of Copiapó in its virtue, acquiring
  the Assignor, as only indemnification of damages, the payments received from
  Minera Lumina Copper Chile S.A. as part of the total price, not being able the
  assignor and/or her heirs to claim the payment of the pending balance of the
  price or the indemnification of any damage. It is expressly prohibited to Mr.
  Ricardo Severo Latorre Ralph to assign all or some installments before referred
  in the clause thirteenth. This prohibition shall be registered in the Registry
  of Prohibitions of the Custodian of Real Estate of Copiapó.

FIFTEENTH:By this instrument, the Assignor
  hereby delivers to Minera Lumina Copper Chile S.A. the titles that attest his
  rights of inheritance being assigning herein and in this act the Assignor also
  transfers the rights of inheritance that are being assigned to Minera Lumina
  Copper Chile S.A., as well as the rights that Mr. Ricardo Severo Latorre Ralph
  had acquired over the estate known as Hijuela del Norte or
  Ramadilla Norte,referred in the clauses Fourth, Fifth, Sixth,
  Seventh and Eighth of the present instrument. The bearer of a certified copy
  of this deed is authorized to request the registration of the present assignment
  of hereditary rights in the Real Estate Registry of the Custodian of Real Estate
  of Copiapó.

SIXTEENTH:For all legal purposes hereof,
  the parties hereto set their domicile as follows: a) Mr. Ricardo Severo Latorre
  Ralph, Atacama 970, Copiapó; b) Minera Lumina Copper Chile S.A. and Mr.
  John J. Selters, Las Nieves street No 3331, County of Vitacura, Santiago.

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SEVENTEENTH:Any notice that is require
  to be communicated from one party to the other in relation to the present contract,
  will be sent through a Public Notary to the domiciles provided in the Clause
  Ninth hereinabove. Any notice of change to the referred domiciles will be communicated
  from one party to the other through a certified letter sent by the Public Notary
  where this public deed is signed.

EIGHTEENTH:The parties hereto agree
  that if the payment day for the payment of any of the installments, as set forth
  in the Clause Thirteenth, falls on Saturday or on any holiday, the payment will
  take place at the following working day.

NINETEENTH:The expenses and rights arising
  from this Agreement and its registration at the Custodian of Real Estate will
  be borne by the Assignee.

TWENTIETH:For all purposes hereof, the
  parties hereto set their domicile in the city of Copiapó and keep under
  the jurisdiction of their Courts of Justice. The bearer of a duly authorized
  copy of this agreement is empowered to require all pertinent annotations, registrations
  and cancellations at the Custodian of Real Estate of Copiapó, as well
  as at any other pertinent Public Record Office.

TWENTY FIRST:The appearing parties,
  hereby grant a power of attorney in favor of Messrs. Jaime Alvarez Cáceres
  and Jerónimo Carcelén Pacheco, so that any of them, indistinctly,
  may grant the public deed or deeds that may be necessary, as well as one or
  more minutes, to clarify, supplement or rectify this public deed, with the purpose
  of

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amending the mistakes and missing wording in this public deed,
  such as the individualization of the appearing parties, the inheritances and
  their registrations, mistakes on the dates of the agreements mentioned in those
  registrations made in any of the Registries of the Custodian of Real Estate
  of Copiapó, or in any other mention that may be required by that Custodian
  in order to clarify, supplement or rectify without affecting the nature and
  purpose of the referred acts and agreements.

The legal capacity of Mr. John J. Selters to act on behalf of
  MINERA LUMINA COPPER CHILE S.A. is stated on the public deed dated August 20th,
  2003, granted before the Public Notary of Santiago, Mr. Eduardo Avello Concha.

The legal capacity of Mrs. Pamela Patricia Latorre Rojas and
  Mr. Ricardo Alfonso Latorre Rojas to act on behalf of Mrs. Elda Gladys Rojas
  Picón, is stated in the general power of attorney granted on August 25th,
  2005, before the Public Notary of Copiapó, Mr. Hernán Cañas Valdés.



MINERA LUMINA COPPER CHILE S.A.



RICARDO SEVERO LATORRE RALPH

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PAMELA PATRICIA LATORRE ROJAS



RICARDO ALFONSO LATORRE ROJAS

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